| /* |
| * (C) Copyright 2007 OpenMoko, Inc. |
| * Written by Harald Welte <laforge@openmoko.org> |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| /* |
| * Boot support |
| */ |
| #include <common.h> |
| #include <command.h> |
| #include <stdio_dev.h> |
| #include <serial.h> |
| |
| #ifdef CMD_TERMINAL_ESC_CH1 |
| static const int esc_ch1 = CMD_TERMINAL_ESC_CH1; |
| #else |
| static const int esc_ch1 = '~'; |
| #endif |
| |
| #ifdef CMD_TERMINAL_ESC_CH2 |
| static const int esc_ch2 = CMD_TERMINAL_ESC_CH2; |
| #else |
| static const int esc_ch2 = '.'; |
| #endif |
| |
| #ifdef CMD_TERMINAL_ESC_DELAY |
| static const ulong esc_dly = CMD_TERMINAL_ESC_DELAY; |
| #else |
| static const ulong esc_dly = CONFIG_SYS_HZ; /* 1 second */ |
| #endif |
| |
| int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char * const argv[]) |
| { |
| int last_tilde = 0; |
| struct stdio_dev *dev = NULL; |
| ulong read_time, last_read_time = 0; |
| int saw_esc_dly; |
| |
| if (argc < 1) |
| return -1; |
| |
| /* Scan for selected output/input device */ |
| dev = stdio_get_by_name(argv[1]); |
| if (!dev) |
| return -1; |
| |
| serial_reinit_all(); |
| printf("Entering terminal mode for port %s.\n" |
| "To leave the terminal and get back to U-Boot, " |
| "send nothing for at least\n" |
| "%lu milliseconds and then quickly send the " |
| "two character sequence \"%c%c\".\n" |
| , dev->name, esc_dly * 1000 / CONFIG_SYS_HZ, esc_ch1, esc_ch2); |
| |
| while (1) { |
| int c; |
| |
| /* read from console and display on serial port */ |
| if (stdio_devices[0]->tstc()) { |
| c = stdio_devices[0]->getc(); |
| read_time = get_timer(0); |
| saw_esc_dly = ((read_time - last_read_time) > esc_dly); |
| last_read_time = read_time; |
| if (last_tilde == 1) { |
| if (c == esc_ch2 && !saw_esc_dly) { |
| putc('\n'); |
| break; |
| } else { |
| last_tilde = 0; |
| /* write the delayed tilde */ |
| dev->putc_raw(esc_ch1); |
| /* and whatever just came in */ |
| dev->putc_raw(c); |
| } |
| } else if (saw_esc_dly && (c == esc_ch1)) { |
| last_tilde = 1; |
| } else { |
| dev->putc_raw(c); |
| } |
| } |
| |
| /* read from serial port and display on console */ |
| if (dev->tstc()) { |
| c = dev->getc(); |
| putc_raw(c); |
| } |
| } |
| return 0; |
| } |
| |
| |
| /***************************************************/ |
| |
| U_BOOT_CMD( |
| terminal, 2, 0, do_terminal, |
| "start terminal emulator", |
| "serial_port" |
| ); |